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In situ imaging of microstructure formation in electronic interconnections.

Abstract：

:The development of microstructure during melting, reactive wetting and solidification of solder pastes on Cu-plated printed circuit boards has been studied by synchrotron radiography. Using Sn-3.0Ag-0.5Cu/Cu and Sn-0.7Cu/Cu as examples, we show that the interfacial Cu6Sn5 layer is present within 0.05 s of wetting, and explore the kinetics of flux void formation at the interface between the liquid and the Cu6Sn5 layer. Quantification of the nucleation locations and anisotropic growth kinetics of primary Cu6Sn5 crystals reveals a competition between the nucleation of Cu6Sn5 in the liquid versus growth of Cu6Sn5 from the existing Cu6Sn5 layer. Direct imaging confirms that the β-Sn nucleates at/near the Cu6Sn5 layer in Sn-3.0Ag-0.5Cu/Cu joints.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Salleh MA,Gourlay CM,Xian JW,Belyakov SA,Yasuda H,McDonald SD,Nogita K

doi

10.1038/srep40010

subject

Has Abstract

pub_date

2017-01-12 00:00:00

pages

40010

issn

2045-2322

pii

srep40010

journal_volume

7

pub_type

杂志文章

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